All the usual stuff applies, check the chassis, bulkhead, oily bits etc.
Don't worry about buying an FFR, unlike the Series vehicles which were 24V throughout 90's & 110's retained there 12V vehicle electrics and the 24V system was an add on which can be completely removed in a very short space of time. Likewise the NATO lighing arrangement, this can be removed and a standard civly light-switch fitted in under an hour making it completely standard. Reverse lights are the same, just fit a switch into the gearbox and the harness is there ready to be connected up.
If you get the right one you will find it will have been fitted with all manner of new parts before being cast whereas if you get the wrong one it could be a complete dog.
It will be basic and be fitted with the 2.5NA D but if you get a good one (I did) you will find it a fine engine with adequate power and will go on forever, things like PAS are an easy DIY fit afterwards.